You couldn't save on memory if everyone was using the same textures? The most hacky but also potentially elegant approach would be to create/modify a game engi

You couldn't save on memory if everyone was using the same textures? The most hacky but also potentially elegant approach would be to create/modify a game engine such that it can render 4 clients at a time onto the same viewport (i.e. 2x2 1080/720p). Just like the good old days with goldeneye64 multiplayer. With a setup like this, you could take advantage of cost sharing throughout. Again, would have to build the game from zero to target this path. I think there could be some economic arguments to be made here. The software and creativity are the only real limitations.